<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>jqueryUITest</title>
<script src="/templates/static/jquery-ui-1.12.1/external/jquery/jquery.js"></script>
<script src="/templates/static/jquery-ui-1.12.1/jquery-ui.js"></script>
    <script src="/templates/static/jquery-ui-1.12.1/jquery-ui.min.js"></script>
     <link rel="stylesheet" type="text/css" href="/templates/static/jquery-ui-1.12.1/jquery-ui.css">
    <link rel="stylesheet" type="text/css" href="/templates/static/jquery-ui-1.12.1/jquery-ui.min.css">
    <link rel="stylesheet" type="text/css" href="/templates/static/jquery-ui-1.12.1/jquery-ui.structure.css">
    <link rel="stylesheet" type="text/css" href="/templates/static/jquery-ui-1.12.1/jquery-ui.structure.min.css">
    <link rel="stylesheet" type="text/css" href="/templates/static/jquery-ui-1.12.1/jquery-ui.theme.css">
    <link rel="stylesheet" type="text/css" href="/templates/static/jquery-ui-1.12.1/jquery-ui.theme.min.css">


</head>
<body>
<input type="text" name="date" id="date" />
<script type="application/javascript">

    $(function () {
        $( "#date" ).datepicker();
    });

    var a1;
    var a2 = true;
    var a3 = 1;
    var a4 = "Hello";
    var a5 = new Object();
    var a6 = null;
    var a7 = NaN;
    var a8 = undefined;
    document.write("<br />");
    document.write(typeof(a1)); //显示"undefined"
    document.write("<br />");
    document.write(typeof(a2)); //显示"boolean"
    document.write("<br />");
    document.write(typeof(a3)); //显示"number"
    document.write("<br />");
    document.write(typeof(a4)); //显示"string"
    document.write("<br />");
    document.write(typeof(a5)); //显示"object"
    document.write("<br />");
    document.write(typeof(a6)); //显示"object"
    document.write("<br />");
    document.write(typeof(a7)); //显示"number"
    document.write("<br />");
    document.write(typeof(a8)); //显示"undefined"
    document.write("<br />");
     var t1="";
    var t2;
    document.write(typeof(t1) );
    document.write("<br />");
    if (t1===undefined) {document.write("t1 is undefined")}
      document.write("<br />");
    if (t2===undefined) {document.write("t2 is undefined")}
</script>
</body>
</html>